Telephone-transmitter.



P. GOTTSGHALK. TELEPHONE TRANSMITTER. Fa, y m I APPLICATION FILED PEB.24,1910. (a 1 I 2 BHEBTB-BHBET 2.

WlJL VESSZFS: AVVENTOR,

Patented Dec. 6, 1910.

' guarded against wa'rdly located UNITED STATES PATET OFFICE.

FELIX GOTISCHALK, OF NEW YORK, Y.

TELErHonnTRANsMIMEn.

Specification of Letters Patent.

Application filed February 24, 1910. Serial No. 545,670.

To all whom it may concern:

Be it known that I, FELIX Go'rrsormmr, a citizen of the United States of America, and resident of New York, in the county of New York and State of NewlYork, have invented certain new and useful Improvements in Telephone-Transmitters, of which the following in a full, clear, and exact description.

The present improvement in telephones is one which relates to the transmitter ot the Bell or analogous type in \vhich'therc in the front of the casingan opening at or near which is the diaphragm.

An object of the invention is to provide an improved and simplified transmitter, and one in which the heretofore almost universally employed forwardly flaring mouthpiece is dispensed with,-one which is entirely sanitary, one which is sightly in appearance and afl'ords to the front of the instrument an attractively plain aspect, and one in which, especially, the diaphragm and other internal portions of the instrument are safethe entrance of moisture, dirt and. foreign matter thereinto, and against being tampered with by malicious or careless persons.

The in'lproved transmitter clearly described in conjunction with the accompanying drawings and set forth in the claims.

In the drawings z Figure 1 is a central sectional View from front to rear, on an enlarged scale, of a telephone transmitter of a modified Bell'tvpe having my improvements thereonyFig. 2 is a front view of the transmitter; Figs. 3 and 4 are views respectively similar to Figs. 1 and 2 but showing certain modifications hereinafter pointed out.

Similar characters of reference indicate corresponding parts in all of the views.

In the drawings, A represents the'casing of the transmitter having as usual therein the forwardly opening aperture 0 back ot' which is the brid eB supporting the resistance'cup O whic comprises the front and rear electrodes and interposed granular carbon as usual.

In .this instrument, as represented in the drawin s, I especially construct the front wall oi the casin with an annular forwardly extending hangs 6 surrounding the opening a and as particularly represented in Fig. 1 this tlange js made with a rearscrew" threaded portion d is fully and.

foraminated wall;

forward of which reduced diameter.

Thediaphragm D of very thin light metal has its position in front of and by its marginal portion extends across the thin edge of the forwardly extending flange Zi, has a rearwardly extending portion f whichis located about the periphery oftheflange at its reduced portion and has out-turned edge portion 9 .which' is accommodated in Patented Dec. 6, 1910.

it is rabbeted'or made of the mace lei-t h the rabbetin ofthe flange.

l y b G- represents a ring having arearwardly located threaded portion h which screw engages the threaded portion d of the flange and having forward of its threaded portion an internal flange 2' which engages the' outturned edge portion of the diaphragm. so that when the ring G is screwed rearwardly onthe threaded forwardly extending flange like extension of the front wall of the easing, it both causes the diaphragm to be drawn taut, and stretched in the manner of a drum head, for entirely closing the aperture through the front of the transmitter casing, and confines the diaphragm in its stated condition and position. The said ring G carries a, foraminous-wall'y' having its location forward of and across the dim the ring and its wall constituting a' phragm, guard which without in. any manner obstructing the action of the sound. Waves duced by speaking on the diaphragm, is etlicient for protecting the diaphragmfrom injury which might result from accidental causes, as by the overturning or dropping of the telephone stand, and also prevents the instrument being tiimpered with as might e done for instance by other object. he wall j.is understood in accordance with the representation of the guard device in Figs. 1 and 2, as made integral with the ring which screw engages'the flange, and it is rendered foraminous by having a mu]- tiplicity of holes m drilled therethrough, and theseholes have their lengths convergent toward the axis of the diaphragm. The guard is also provided With holes 0 0 in the ring or rim portion thereof between the part which isscrew threaded and its forward part adjoining which is the front and by the provision of these rim holes the guard is prevented from causing reverberation therewithimand also thereby it becomes possible to direct speech a person tapping the diaphragm with a pencil or against the diaphragm of the transmitter even at a very slight angle to the diaphragm, and, moreover, in case, as rarely might happen, the instrument became deluged with water, there would be a self clearing of the latter from the front of the diaphragm, and.

with no liability that the moisture would find its way into the interior of the instrument.

As represented in Fig. 1, the diaphragm has as an integral rear appliance thereof the spider frame 8 which extends to the front electrode t,-the hub-like rear central part of this spider frame having an embracing engagement about a forwardly screw threaded stud a which is supported by and projects forwardly from the front electrode and the contact adjustment of the spider frame with the front electrode is regulated by the nut 'v.

In Figs/3 and 4 the ring G screw engaging the externally threaded forwardly extending flange B of the transmitter caeing which somewhat Widely encircles the speech entrance opening is employed a clampin' rately ormed disk shaped member of foraminous material, such as wire gauze, j at its edge which marginally overlaps the circular front edge of the flange, against the latter,-the sald ring having an internal flange constituting a shoulder for its bindmg coeotion in relation to the front edge of ing from the frdnt electrode,the form of.

guard shown in Fig. 1 may be employed in place of the one shown in Fig. 3, although the guard of F 1g. 1. serves the double duty of guard and diaphragm tautener and retamer While that of F 1g. 3 serves as a guard only.

member for confining the sepal. A telephone transmitter having in the casing thereof a front opening with a forwardly extending surrounding flange, and having the diaphragm adjacent said opening, and a ring, having at a rear portion thereof a screw engagement with said for- \vardly extending flange and carrying a foraminous guard wall the location of which isforward of, and across, said opening, and

said ringbcing provided with apertures between its screw engaging portion and said guard-wall.

2. A telephone transmitter having in the .casing thereof a front opening with a for- \vardly extending surrounding flange, and having the diaphragm adjacent said opening, and a ring, screw-engaging said for wardly extending flange and carrying a wall, the location of which is forward of,

ter, extended rearwardly about the periphery of the flange, and having an out-turned edge portion, and a ring, having a rearwardly located threaded portion screw engaging the flange and having forward of its threaded portion an internal flange which engages the out-turned edge portion of the diaphragm, and said ring carrying a foraminous wall, having its location forward of and across the diaphragm.

4. A telephone transmitter having in the casing thereof a front opening with a forwardly extending surrounding flange, and having a diaphragm across and adjacent said opening, a ring, screw engaging the flange and having an inwardly extending annular shoulder, and a circular foraminous member marginally overlapping the circular edge of the flange, and confined by said annular shoulder between the latter and the flange edge.

Signed by me at Springfield, Mass, in presence of two subscribing witnesses.

FELIX GOTTSCHALK.

Witnesses:

WM. S. BELLows, G. R. Dnrsconn. 

